98 V. T. CLEVK, SYNOPSIS OF THE NAVICULOID DIATOMS. ■ 



margin and with a linear marking on eacli side of the central nodule. Striae 4 in 0,oi mm., 

 slightly divergent in the middle and at the ends. — Nav. lobata GtROVE a. Sturt J. Q. M. 01. (2) 

 III p. 133 PI. X f. 12. Nav. spathifera Grove a. Sturt A. S. Atl. CLXXIV f. 23. 

 Marine: Oaniaru Dept., New Zealand! San Pedi'o Dept. (Kinker Coll.)! 



79. P. constricta Cl. N. Sp. — V. small, constricted in the middle, witli apiculate ends. 

 L. (),o:5.t; B. 0,(1 1 mm. (at the constr. 0, oil's mm.). Terminal fissures small. Axial area narrow; 

 central a transverse, broad fascia. Strise 8 to 9 in (t,(ii mm., parallel. — PI. T f. 14. 



Marine: (ralapagos Islands! 



80. P. Temperel Brun (1889). — V. broad, with parallel or slightly concave margins, and 

 cuneate, obtuse ends. L. (),\4 to 0,ir); B. 0,045 to (),o.5r> mm. Median line with distant central 

 pores and small, hook-shaped, terminal fissures, bordered on each side by lines, divergent towards 

 the middle of the valve. Area M'ide, lanceolate, dilated around the central nodule. Strise 7 to 

 8 in 0,0 1 mm. in the middle i-adiate, and sometimes alternately longer and shorter, parallel at the 

 ends. — Nar. Tnnperei Brun Diat. du Japon p. 45 PI. V f. 1. -- A. S. Atl. CLXXIV f. 24. 



Marine: Sendai Dept. Japan! 



81. P. Trevelyana Donk. (18G1). — V. linear, slightly gibbous in the middle and at the 

 broad, rounded ends. L. 0, i to 0,ir); B. 0,o2 to 0,o2.'j mm. Median line excentric towards the ends 

 and somewhat flexuose, bordered on each side by a longitudinal line. Terminal fissures large, 

 hook-shaped. Axial area narrow, linear. Central area large, orbicular. Strijie strongly radiate 

 in the middle and convergent at the ends, 10 in 0,oi mm., crossed by a narrow depression. — 

 Nar. Trev. Donk. M. J. I (N. S.) p. 8 PL I f. 2. Br. D. p. fiG PI. X f. 0. V. H. Syn. p. 74 

 Su])pl. A f. 5, G. Finn. T. Rabh. E. A. p. 210. 



Marine: North Sea (Coa.sts of Sweden, England, Scotland, Belgium)! Florida (Pensacola)! Japan! 



Var. angusta Cl. — V. linear. L. 0, i to 0,i6; B. 0,oi to 0,015 mm. Strise 9 to 10 in 0,oi 

 mm. — Nar. Trev. var. himgarica Pant. Ill PL XLII f. 575 (1893)? 



Marine: (xulf of Naples! Sumatra (Deby Coll.)! (lalapagos Islands! Bermudas (Rae Coll.)! 



Stauroneis Brehissonii Castr. (Chall. Voy. p. 24 PL XV f. 4) appears to be akin to V. Trc- 

 velyana. 



82. P. groenlandica Cl. (1881). — V. lanceolate, with rounded ends. L. 0,117; B. 0,o2;^ 

 mm. Median line central, angixlarly bent towards the central nodule. Terminal fissures hook- 

 shaped. Axial area narrow, linear; central area large, orbicular. Stripe strongly radiate in the 

 middle, convergent towards the ends, (5 to 7, .5 in 0,0 1 mm., cros.sed by a narrow lateral area. - 

 Na;r. (jroenl. Cl. N. R. D. p. 7 PL I f. 13. 



Marine: Davis Strait! 



83. P. rectaiigulata Greg. (1857). — V. linear, frequently slightly gibbous in the middle 

 and at the ends. L. 0,065 to 0,i; B. 0,oi5 to 0,o2 mm. Median line central, with strong, hook- 

 shaped terminal fissures. Axial area indistinct; central area large, rounded-quadrate. Strict 

 strongly radiate in the middle, convergent at the ends, 8 to 10 in 0,oi mm. — Nav. red. Greg. 

 D. of Clyde p. 479 PL IX f. 7. Donk. B. D. p. m PL X f. 5. V. H. Syn. p. 74 Suppl. A f. 7. 

 Nav. Regida Grun. in Cl. D. West Ind. p. 5 PL I f. 3. Nav. lumen Perag. A^illefr. p. 45 PL II 

 f. 19. Pinnul. rect. Rabh. E. A. p. 215. 



Marine: North Sea (Coasts of Sweden, Scotland, England, Belgium)! Mediterranean (Perag.), 

 Labuan! West Indies! Campeachy Bay (Grun.). 



Forma suhundulata Grun. (1882). — V. with slightly undulate margins. — C'l. M. D. N:o 301. 

 Marine: Firth of Tay! 



84. P. Htauiitonii Grun. (1882). — V. asymmetrical, linear, convex, slightly gibbous in the 

 niiddle, with broad, rounded ends. L. 0,u5:?; B. 0,oi mm. Median line excentric, with hook-sliaped 



